Minicamera for proximity detection of nuclear radiation emitted

Details Minicamera for proximity detection of nuclear radiation emitted Minicamera for proximity detection of nuclear radiation emitted

1994-04-25

1995-06-27

Dzierzynski, Paul M.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25036309, 250362, G01T 120

Patent

active

054282233

ABSTRACT:
A minicamera detects at least one .beta. and .gamma. nuclear radiation (or assimilated) emitted by a radioisotope present in a body (1, 2). Its image pick-up head (300) includes a collimator (301), a scintillator (302) and a photodetector assembly (303 to 309). In accordance with the invention, the image pick-up head (300) also includes a modulating grid (312) with holes which is arranged between the collimator (301) and the scintillator (302). The grid can completely open or close the collimator under the influence of a suitable mechanism (313). The signals acquired by the photodetector assembly in the open position are applied to a first image memory (423) whereas those acquired in the closed position are applied to a second image memory (424). Comparison and calculation means (421) provide the desired useful signal by simple subtraction of the contents of the two memories (423, 424).

REFERENCES:
patent: 3940626 (1976-02-01), Hounsfield
patent: 4595014 (1986-06-01), Barrett et al.

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